+91-87964 74404
FlagBACK
Question icon
Grade 12Wave Optics

Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find
(a) the maximum kinetic energy of the photoelectrons and
(b) the stopping potential.

Profile image of karthik
8 Years agoGrade 12
Answers icon

1 Answer

Profile image of Arun
8 Years ago
(a) K.E. = (hc / \lambda)  – \phi0
 = (1242 ev-nm/ 280 nm) – 2.5 ev
 = 1.9 ev
(b) stopping potential is given by
 ev = K.E.max
 V = 1.9 ev / e
 = 1.9 Volt

Other Related Questions on wave optics

question mark

what is meant by refractive index?

wave optics
1 Answer Available

Last Activity: 9 Months ago

question mark
An oscillator consists of a block of mass 512 g connected to a spring. When set into oscillation with amplitude 34.7 cm, it is observed to repeat its motion every 0.484 s. Find (a) the period, (b) the frequency, (c) the angular frequency, (d) the force constant, (e) the maximum speed, and ( f ) the maximum force exerted on the block.
wave optics
1 Answer Available

Last Activity: 4 Years ago

question mark
A PLANE TRANSMISSION GRATING HAS 45000 LINES. DETERMINE ITS RESOLVING POWER IN THE SECOND ORDER FOR WAVELENGTH OF 5000A.
 
wave optics
1 Answer Available

Last Activity: 4 Years ago

question mark
A PLANE TRANSMISSION GRATING HAS 45000 LINES. DETERMINE ITS RESOLVING POWER IN THE SECOND ORDER FOR WAVELENGTH OF 5000A.
wave optics
1 Answer Available

Last Activity: 4 Years ago

question mark
If V-numer of a multi mode fiber is 3. Calculate the no.of modes if it is step index and graded index fiber multimode fiber (rounded off)?
wave optics
1 Answer Available

Last Activity: 4 Years ago